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Warming experiment testsfor the effect of soil-borne pathogens on maintaining tree species diversity

报告题目：Warming experiment testsfor the effect of soil-borne pathogens on maintaining tree species diversity

系列：“生态与环境讲坛”系列第 163 讲

报告人：刘宇特聘副研究员

时间：2017年3月9日 (周四) 上午9:10-12:00

地点：环境与生态学院A239报告厅

来访单位：中山大学

邀请人：李庆顺

摘要：Soil-borne pathogens have widely been recognized as an important agent for maintaining biodiversity (i.e., the Janzen-Connell effect). However, there is little understanding how climate change may affect the interaction between specialized pathogens and their hosts. We conducted field warming experiments using open-top chambers and collected soil-borne fungal DNA metabarcoding data to assess the effect of soil-borne pathogens on seedling recruitment of tree species in response to climate warming in a temperate forest and a subtropical forest. Results show that, although seedling mortality of study tree species induced by soil-borne pathogens was increased by warming treatment in both forests, the seedling mortality in the temperate forest was higher than that in the subtropical forest. Warming climate could intensify severity of plant diseases possibly because warming would increase host plant susceptibility and promote pathogen growth. Our results suggest that global warming would likely increase the effect of specialized pathogens on maintaining tree species diversity in temperate and the subtropical forests.